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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72cac96a58e738d63ffc4478bf2cd25bdb9a3810deda96247e553896af0b5277' 
  AND token = 'Sent/A21G3561wRv+nbNFuxYCxcH/0z0u5YYc7ikksg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}